NCERT Class XII Chemistry <br> Chapter - Alcohols, Phenols and Ethers <br> Questions with Solutions

NCERT Class XII Chemistry
Chapter - Alcohols, Phenols and Ethers
Questions with Solutions

Question : 19

Total: 45

Write the mechanism of acid dehydration of ethanol to yield ethene.

Solution:

In the presence of conc. acids such as H3PO4 and H2SO4, alcohols undergo dehydration to yield alkenes.

H3C−

CH2

Ethanol

−OH

conc.H+∕Δ

––––––––▶

CH2=CH2

Ethane

+H2O

The mechanism for this reaction is :
Step 1 : Protonation of ethanol

Step 2 : Formation of carbocation

Step 3 : Formation of ethene and regeneration of proton

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